Method for ironing spline teeth in pressed stepped sheetmetal and sheetmetal clutch drum formed by same
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United States of America Patent
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May 22, 2001
Grant Date -
N/A
app pub date -
Sep 8, 1999
filing date -
Jul 31, 1997
priority date (Note) -
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Abstract
A method is provided for forming spline teeth on the walls of a press-formed sheet-metal article on which two peripheral walls of different diameters are disposed in a continuous manner via a step portion by means of a die with a plurality of steps of ironing surfaces, and a punch having a plurality of corresponding ironing surfaces. The punch is provided with a first punch and a second punch which are arranged in a split manner. The second punch first irons teeth on the larger diameter peripheral wall. While the first punch is next used to iron teeth on the smaller diameter peripheral wall, at least some of the pressurizing force on the second punch is maintained to avoid the creation of flaws in the step portion of the sheet metal article.
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